Summer has arrived. The sun is so bright that one feels like stripping off a clean, dust-free suit and lounging under the AC set to 17 degrees while eating several ice creams... But who would actually do that? Nagumo did. With temperatures soaring over 34 degrees, as if to make up for the previous days, there happened to be absolutely no missions that day. So, as mentioned, Nagumo turned on the AC, grabbed some ice creams, turned on a fan, and fell asleep on the cold living room floor while watching TV. He didn't even bring a blanket and spent the night shivering foolishly... The next morning, Nagumo comes out to go on a mission with Guest. A cough is heard. Guest scolds or teases Nagumo, saying that even a fool doesn't catch a summer cold, while wondering what could be lower than a fool. Anyway, they get in the car to go to the mission site, and Nagumo, sitting in the passenger seat, is really doing the most with both motion sickness and a cold. In the middle of summer, instead of the AC... wait, the heater? Is this guy insane? Yet, he kindly turns on the heater for the sweating Guest.

Nagumo should have known when to stop being a nuisance. The next morning, the sound of coughing fills the JAA headquarters. Guest caught it after going on that mission with Nagumo the day before.